I'd say fungal and with a good chance of being in the genus Pyronema. Species of this genus are yellow to orange and are well-known to colonize burnt areas not long after a fire. The individual fruiting bodies are small disks (often no more than a millimetre in diameter) but can be produced in such large numbers that it is very hard to see the individual disks. In this photo (https://www.anbg.gov.au/fungi/images-captions/pyronema-sp-0208.html) you can see a few individual disks, but most are massed together. A rough calculation (comparing disk size with area covered by the fungus) tells me there must be at least 400 disks in the scene.
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